Gestra Two Channel Level Switch Pump On/Off & High Alarm 24VDC
The level switch NRS 1-54 operates in conjunction with level electrodes NRG 16-.. and ER 5 and functions as a water level controller (for instance) in steam boilers and (pressurised) hot-water installations. The level switch also detects and indicates a MIN or a MAX water level.

The level switch can work with the following level electrodes: NRG 10-52, NRG 16-52, NRG 16-36, NRG 16-4 and ER 5.-1.

The level switch NRS 1-54 and NRS 1-55 operate on the conductive measuring principle using the electrical conductivity of water. The level switch design is for differing electrical conductivities and connecting three electrode rods.

The level switch works as an on-off water level controller (for fill or discharge control) and indicates when the preset MAX or MIN water level (MAX: NRS 1-54; MIN: NRS 1-55) occurs.

The lengths of the associated electrode rods determine the switch points for water level control and MIN or MAX water level.

The equipment monitors the water level by sensing whether the electrode rods are exposed or immersed and energise or de-energise the controller output contact, which will switch the feedwater pump on or off. The LED “Pump” is illuminated when the feedwater pump is switched on by the level switch.

The level switch detects that the MIN or MAX water level occurs when the corresponding electrode rod is exposed or submerged. After the de-energizing delay has elapsed, the MIN / MAX output contact is switched over. At the same time, the MIN or the MAX LED changes from green to red.

The "Test" button allows a simulation of a MIN or MAX alarm.